Etymotic ER4 SR/XR Noise-Isolating Earphones noise-isolating Specifally developed Gecko 360° technology

Specifally developed Gecko 360° technology with innovative Fix & Follow Voice-Tracking

FULL METAL CNC SCULPTED CHASSIS

so you can enjoy your favorite film

providing 35-42 dB attenuation (depending on eartips used and the depth of insertion)

Etymotic ER4 SR/XR Noise-Isolating Earphones noise-isolating Specifally developed Gecko 360° technologyWhich ER4 is right for you? Both ER4 models, the ER4SR and ER4XR, use the same Balanced Armature (BA) drivers. The only difference is the tuning of the lower (bass) frequencies. The ER4SR, being the reference model, is tuned to be as precise and flat as possible. The ER4XR, being the fun model, is tuned with added bass. As you can see from the frequency response graphs below, ER4XR adds 1 2dB to the mid bass frequencies (below 200Hz) and 3 4dB to the